BIOD 351/ BIOD351 Module 3 Exam: Pharmacology |
Latest 2025/ 2026 Update | 100 OUT OF 100
|Questions and Verified Answers | 100% Correct –
Portage Learning.
A 25 year old man visit his doctor to determine the cause of his infertility. Semen analysis results
in a diagnosis of azoospermia. You suspect that there may be a _____.
a. blockage of the vas deferens.
b. spermiogenesis defect.
c. loss of dihydrosterone.
d. abuse of estrogen.
a. blockage of the vas deferens.
or...
b. spermiogenesis defect.
In studying a genetic form of Hirschsprung's disease due to an EDN3 mutation, you have
identified a selective defect in the migration of sacral neural crest. Based on your understanding
of enteric neural crest migration, which of the following regions of the GI tract would you expect
to be most affected?
a. colon.
b. liver.
c. pancreas.
d. stomach.
e. esophagus.
a. colon.
,During early development, the gut tube becomes separated from which structure?
a. notochord.
b. yolk sac.
c. neural tube.
d. heart.
e. somites.
b. yolk sac.
Myelin is formed by ____ in the peripheral nervous system and ____ in the central nervous
system.
a. astrocytes, ependymal cells.
b. ependymal cells, astrocytes.
c. oligodendrocytes, schwann cells.
d. parasympathetic neurons, sympathetic neurons.
e. schwann cells, oligodendrocytes.
e. schwann cells, oligodendrocytes.
You laboratory has identified a rare loss-of-function mutation in runx1. runx1 is a transcription
factor that normally promotes the differentiation of trka epxressing neurons in the DRG. Which
of the following phenotypes would you predict in a runx1- mouse model?
a. hypersensitivity to pain.
b. enhanced muscle stretch reflexes.
c. reduced sensitivity to pain.
d. decreased muscle stretch reflexes.
c. reduced sensitivity to pain.
, What strucures derive from the otic placode?
a. cochlea and semicircular canals.
b. lens.
c. malleus and ear drum.
d. stapes, incus, and malleus.
e. vestibulocochlear nerve.
a. cochlea and semicircular canals.
Hydrocephalus often results from a disruption in cerebrospinal fluid (CSF) flow leading to
abnormal swelling of the cerebral ventricles (see MRI images). What cell type plays an
important role in promoting CSF flow via movement of cilia on the apical cell surface?
a. endothelial cells.
b. oligodendrocytes.
c. astrocytes.
d. ependymal cells.
d. ependymal cells.
The diagrams below shut two lower motor neurons innervating two muscle fibers at different
stages of development. Which diagram provides the best example of a fully mature, adult pattern
of connectivity?
B.
While hiking, your arm gets caught by the thorns of an ocotillo plant, tearing the skin.
Eventually, the skin heals by producing thickened scar tissue. This is an example of...
a. stem cell mediated regeneration.
b. morphallactic regeneration.
c. epimorphic regeneration.
Latest 2025/ 2026 Update | 100 OUT OF 100
|Questions and Verified Answers | 100% Correct –
Portage Learning.
A 25 year old man visit his doctor to determine the cause of his infertility. Semen analysis results
in a diagnosis of azoospermia. You suspect that there may be a _____.
a. blockage of the vas deferens.
b. spermiogenesis defect.
c. loss of dihydrosterone.
d. abuse of estrogen.
a. blockage of the vas deferens.
or...
b. spermiogenesis defect.
In studying a genetic form of Hirschsprung's disease due to an EDN3 mutation, you have
identified a selective defect in the migration of sacral neural crest. Based on your understanding
of enteric neural crest migration, which of the following regions of the GI tract would you expect
to be most affected?
a. colon.
b. liver.
c. pancreas.
d. stomach.
e. esophagus.
a. colon.
,During early development, the gut tube becomes separated from which structure?
a. notochord.
b. yolk sac.
c. neural tube.
d. heart.
e. somites.
b. yolk sac.
Myelin is formed by ____ in the peripheral nervous system and ____ in the central nervous
system.
a. astrocytes, ependymal cells.
b. ependymal cells, astrocytes.
c. oligodendrocytes, schwann cells.
d. parasympathetic neurons, sympathetic neurons.
e. schwann cells, oligodendrocytes.
e. schwann cells, oligodendrocytes.
You laboratory has identified a rare loss-of-function mutation in runx1. runx1 is a transcription
factor that normally promotes the differentiation of trka epxressing neurons in the DRG. Which
of the following phenotypes would you predict in a runx1- mouse model?
a. hypersensitivity to pain.
b. enhanced muscle stretch reflexes.
c. reduced sensitivity to pain.
d. decreased muscle stretch reflexes.
c. reduced sensitivity to pain.
, What strucures derive from the otic placode?
a. cochlea and semicircular canals.
b. lens.
c. malleus and ear drum.
d. stapes, incus, and malleus.
e. vestibulocochlear nerve.
a. cochlea and semicircular canals.
Hydrocephalus often results from a disruption in cerebrospinal fluid (CSF) flow leading to
abnormal swelling of the cerebral ventricles (see MRI images). What cell type plays an
important role in promoting CSF flow via movement of cilia on the apical cell surface?
a. endothelial cells.
b. oligodendrocytes.
c. astrocytes.
d. ependymal cells.
d. ependymal cells.
The diagrams below shut two lower motor neurons innervating two muscle fibers at different
stages of development. Which diagram provides the best example of a fully mature, adult pattern
of connectivity?
B.
While hiking, your arm gets caught by the thorns of an ocotillo plant, tearing the skin.
Eventually, the skin heals by producing thickened scar tissue. This is an example of...
a. stem cell mediated regeneration.
b. morphallactic regeneration.
c. epimorphic regeneration.
